feat: isolate styles from page contents

[dustin-jw]

Description

This is meant to prevent page styles from interfering with the panel's styles by reverting all properties within the panel, then setting whatever styles we need. There are some specificity issues that need to be figured out, though. For example, if you run the extension against bugzilla, the button will use global page styles.

To Validate

1. Pull down this branch
2. Run npm run build
3. Load the extension in Chrome or Firefox
4. Go to bugzilla or another page that has known styles that interfere with the panel
5. Run the extension, confirming that the button (and other components/elements) have the intended panel styles and no styles from the page's CSS

[github-actions]

📦 Extension packages built successfully!

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